Variant &3: Completion date &1 is after the startup date &2

What causes this issue?

Completion date &V1& that was entered is after the startup date &V2& of
the variant. The completion date always has to be before the startup
date (&V2&).

System Response

The entry is not allowed.

How to fix this error?

Do one of the following:
Correct completion date &V1& that you entered so that it is before or
the same date as startup date &V2&.
Correct startup date &V2&, so that it is after or the same date as
completion date &V1&.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.